Methods: The split-half method and the equivalentformmethod were used, and the concurrent validity and predictive validity of the criterion-related validity were tested.
方法：采用分半相关法，复本法以及效标关联效度的同时效度和预测效度进行检验。
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Method of completing square is often used when transforming a quadratic form into a normal one, whose process is equivalent to making the relevant matrix contract diagonal.
Researches show that the equivalent load method couldn't be used to calculate the prestressing action in the combination form, but the method of restraining secondary moments should be used.